Download Daewoo Electronics DVST7D3/4D3/2D3 User's Manual

S/M No. : VTG7J3DET0
Service Manual
Video Cassette Recorder
ALL T-MECHA (Hi-Fi/MONO)
Model: (PAL/SECAM MODELS)
DVST7C3/4C3/2C3 Series
DVST7E3/4E3/2E3 Series
DVST7M3/4M3/2M3 Series
DVST7J3/4J3/2J3 Series
DVST7D3/4D3/2D3 Series
DVST7T3/4T3/2T3 Series
DVST7W3/4W3/2W3 Series
DVST7L3/4L3/2L3 Series
DVST7L3
DVST7E3
2
DVST7C3
DVST7B3
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Apr. 2002
TABLE OF CONTENTS
SAFETY&PRECAUTIONS ................................................................................................ 2
EXTERNAL VIEWS ......................................................................................................... 4
FRONT VIEWS FUNCTION .................................................................................................................... 4
REAR VIEWS FUNCTION ...................................................................................................................... 6
ELECTRICAL ADJUSTMENT............................................................................................ 7
SPECIFICATIONS ......................................................................................................... 8
CIRCUIT INFORMATION ............................................................................................... 9
INTERCONNECT WIRING DIAGRAM..................................................................................................... 9
POWER CIRCUIT DIAGRAM................................................................................................................. 10
POWER BLOCK DIAGRAM .................................................................................................................. 12
SYSCON CIRCUIT DIAGRAM ............................................................................................................... 13
SERVO & SYSCON BLOCK DIAGRAM .................................................................................................. 15
A/V & SECAM COLOR CIRCUIT DIAGRAM........................................................................................... 16
VIDEO PLAYBACK/RECORD PATH FOR PAL .......................................................................................... 18
HIFI & SW CIRCUIT DIAGRAM.............................................................................................................. 19
PIF CIRCUIT DIAGRAM........................................................................................................................ 21
COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ............................................ 23
PCB MAIN.......................................................................................................................................... 23
DISASSEMBLY ............................................................................................................. 24
PACKING ASS’Y ................................................................................................................................. 24
FRONT PANEL ASSEMBLY ................................................................................................................... 25
INSTRUMENT DISASSEMBLY ................................................................................................................. 29
ELECTRICAL PARTS LIST ............................................................................................... 30
PCB MAIN AS .................................................................................................................................... 30
1
SAFETY & PRECAUTIONS
SAFETY CHECK AFTER SERVING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires
have been returned to original positions. Afterwards, perform the following tests and conform the specified values in order
to verify compliance whit safety standards.
1. Insulation resistance test
Confirm the specified insulation resistance between power cord plug prong and externally exposed parts of the set
(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)
isgreater than values given in table 1 below.
2. Dielectric strengthen test
Confirm specified dielectric strengthen between power cord
plug prongs and exposed accessible parts of the set
(RF terminals, antenna terminals, video and audio input output
terminals, microphone jack, ear phone jacks, etc.)
is greater than values given table 1.
3. Clearance distance
When replacing primary circuit component, confirm specified clearance distance (d), (d’) between soldered terminals,
and between terminals and surrounding metallic parts. See table below.
Rating for selected areas
AC Line Voltage
Region
Insulation
Resistance
Dielectric
Strength
Clearance
Distance(d),(d)
100V
Japan
>1MΩ/500V DC
1kV AC 1min.
>3
110 to 130V
USA & Canada
-
900V AC 1min.
> 3.2
* 110 to 130V
200 to 240V
Europe
Australia
Latin America
>10MΩ/500V DC
4kV AC 1min.
> 6(d)
> 8(d')
(a :Power cord)
* : Class model only
NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values for your
particular country and locality
2
SAFETY & PRECAUTIONS
4. Leakage current test
Confirm specified or lower leakage current between B(earth
ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input
output terminals, microphone jacks, earphone jacks, etc.)
Measuring method:(Power ON) Insert load Z between B(earth
ground, power cord plug prongs) and exposed accessible parts.
Use on AC voltmeter to measure across both terminals of load Z.
See figure2 and following table.
Leakage current ratings for selected are as
AC Line Voltage
Region
100V
Japan
110 to 130V
USA &Canada
110 to 130V
200 to 240V
Europe
Australia
Leakage Current(i)
Clearance Distance(d),(d’)
i < 1 mArms
Exposed accessible parts
i < 0.5mArms
Exposed accessible parts
2kΩ
i< 0.7mA peak
i< 2mAdc
Antenna earth terminals
50kΩ
i< 0.7mA peak
i < 1mAdc
Other terminals
Load Z
1kΩ
15kmF
1kΩ
NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.
3
EXTERNAL VIEWS
1. FRONT VIEWS FUNCTION
DVST7C3 FRONT VIEW
DVST7E3 FRONT VIEW
DVST7L3 FRONT VIEW
DVST7M3 FRONT VIEW
4
EXTERNAL VIEW
DVST7J3 FRONT VIEW
DVST7D3 FRONT VIEW
DVST7B3 FRONT VIEW
DVST8T3 FRONT VIEW
DVST8W3 FRONT VIEW
POWER
STOP / EJECT
RECORD
FRONT VIDEO/AUDIO INPUT JACK
REWIND / REVIEW
FAST FORWARD / CUE
PLAY BACK
CHANNEL UP / DOWN
5